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124 lines
2.9 KiB
C++
124 lines
2.9 KiB
C++
//
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// Instruction.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 15/01/21.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef InstructionSets_M50740_Instruction_h
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#define InstructionSets_M50740_Instruction_h
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#include <cstdint>
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#include "../AccessType.hpp"
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namespace InstructionSet {
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namespace M50740 {
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enum class AddressingMode {
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Implied, Accumulator, Immediate,
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Absolute, AbsoluteX, AbsoluteY,
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ZeroPage, ZeroPageX, ZeroPageY,
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XIndirect, IndirectY,
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Relative,
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AbsoluteIndirect, ZeroPageIndirect,
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SpecialPage,
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ImmediateZeroPage,
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AccumulatorRelative, ZeroPageRelative
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};
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static constexpr auto MaxAddressingMode = int(AddressingMode::ZeroPageRelative);
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static constexpr auto MinAddressingMode = int(AddressingMode::Implied);
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constexpr int size(AddressingMode mode) {
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// This is coupled to the AddressingMode list above; be careful!
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constexpr int sizes[] = {
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0, 0, 1,
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2, 2, 2,
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1, 1, 1,
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1, 1,
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1,
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2, 1,
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1,
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2,
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1, 2
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};
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static_assert(sizeof(sizes)/sizeof(*sizes) == int(MaxAddressingMode) + 1);
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return sizes[int(mode)];
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}
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enum class Operation: uint8_t {
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Invalid,
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// Operations that don't access memory.
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BBC0, BBS0, BBC1, BBS1, BBC2, BBS2, BBC3, BBS3,
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BBC4, BBS4, BBC5, BBS5, BBC6, BBS6, BBC7, BBS7,
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BCC, BCS,
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BEQ, BMI, BNE, BPL,
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BVC, BVS, BRA, BRK,
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JMP, JSR,
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RTI, RTS,
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CLC, CLD, CLI, CLT, CLV,
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SEC, SED, SEI, SET,
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INX, INY, DEX, DEY,
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FST, SLW,
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NOP,
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PHA, PHP, PLA, PLP,
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STP,
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TAX, TAY, TSX, TXA,
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TXS, TYA,
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// Read operations.
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ADC, SBC,
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AND, ORA, EOR, BIT,
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CMP, CPX, CPY,
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LDA, LDX, LDY,
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TST,
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// Read-modify-write operations.
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ASL, LSR,
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CLB0, SEB0, CLB1, SEB1, CLB2, SEB2, CLB3, SEB3,
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CLB4, SEB4, CLB5, SEB5, CLB6, SEB6, CLB7, SEB7,
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COM,
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DEC, INC,
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ROL, ROR, RRF,
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// Write operations.
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LDM,
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STA, STX, STY,
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};
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static constexpr auto MaxOperation = int(Operation::STY);
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static constexpr auto MinOperation = int(Operation::BBC0);
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constexpr AccessType access_type(Operation operation) {
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if(operation < Operation::ADC) return AccessType::None;
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if(operation < Operation::ASL) return AccessType::Read;
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if(operation < Operation::LDM) return AccessType::Write;
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return AccessType::ReadModifyWrite;
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}
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constexpr bool uses_index_mode(Operation operation) {
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return
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operation == Operation::ADC || operation == Operation::AND ||
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operation == Operation::CMP || operation == Operation::EOR ||
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operation == Operation::LDA || operation == Operation::ORA ||
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operation == Operation::SBC;
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}
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struct Instruction {
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Operation operation = Operation::Invalid;
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AddressingMode addressing_mode = AddressingMode::Implied;
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uint8_t opcode = 0;
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Instruction(Operation operation, AddressingMode addressing_mode, uint8_t opcode) : operation(operation), addressing_mode(addressing_mode), opcode(opcode) {}
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Instruction(uint8_t opcode) : opcode(opcode) {}
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Instruction() {}
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};
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}
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}
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#endif /* InstructionSets_M50740_Instruction_h */
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